Sheet product dispensers and related methods for reducing sheet product usage
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Solution Overview
Problem
Conventional sheet product dispensers either provide insufficient resistance, leading to excessive rotation and waste, or inconsistent resistance that varies over the life of the roll, resulting in an undesirable user experience and increased costs due to unnecessary sheet product usage.
Innovation Solution
A sheet product dispenser with a roll support mechanism and a resistance mechanism that provides a consistent pull force resistance between 36 grams-force and 96 grams-force throughout the majority of the roll's life, ensuring controlled unwinding and reducing waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If significant resistance is provided to prevent free-wheeling and over-rotation of the roll, then sheet product waste is reduced, but the resistance becomes intermittent and varies significantly during use, resulting in user frustration
Solution Approach 1:
The resistance mechanism uses a spring-loaded arm that dynamically adjusts its engagement with the roll to provide substantially constant pull force resistance. The spring allows the resistance to adapt as the roll diameter changes during use, maintaining consistent operational characteristics throughout the roll's life while preventing over-rotation and sheet product waste.
Solution Approach 2:
The invention changes the physical parameters of the resistance mechanism, specifically using a spring with calibrated force characteristics to provide substantially constant pull force resistance. This parameter optimization ensures the resistance remains within a specific range (36-96 grams-force) throughout the roll's life, resolving the contradiction between waste reduction and user experience.
2Quantity of substance
If significant resistance is provided to reduce over-rotation, then sheet product usage is controlled, but the resistance varies significantly over the life of the roll, causing inconsistent user feel and perception
Solution Approach 1:
The spring-loaded resistance mechanism dynamically compensates for changes in roll diameter during use. As the roll becomes smaller, the spring adjusts to maintain substantially constant pull force resistance, ensuring consistent user experience and stable operational characteristics throughout the entire life of the roll while controlling sheet product usage.
Solution Approach 2:
The resistance mechanism incorporates a feedback loop where the spring continuously adjusts its engagement force based on the roll's current state. This automatic feedback ensures the pull force resistance remains substantially constant (36-96 grams-force) throughout the roll's life, preventing both over-rotation and inconsistent user experience.
3Ease of operation
If minimal resistance is provided to allow easy dispensing, then user operation is simple, but the roll continues to rotate well beyond the necessary length due to inertia, causing waste
Solution Approach 1:
The resistance mechanism applies preliminary opposing force to the roll's rotation before excessive unwinding occurs. By providing substantial pull force resistance (36-96 grams-force) from the beginning of each dispensing action, the system counteracts the inertial tendency of the roll to continue rotating, thereby preventing over-rotation and sheet product waste while still allowing easy operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The consistent resistance mechanism reduces sheet product usage by 20-30% and provides a consistent user experience by maintaining optimal resistance levels throughout the roll's life, minimizing waste and costs.
Implementation Method 1
The arm is configured to frictionally engage a surface of the roll of sheet product. The spring is attached to the arm and configured to bias the arm into engagement with the surface of the roll of sheet product such that the resistance mechanism provides a pull force resistance opposing a pull force applied by a user
Data Source
AI summary
A resistance mechanism for a sheet product dispenser for dispensing a length of sheet product from a roll of sheet product rotatably supported by the sheet product dispenser is provided. The resistance mechanism includes an arm configured to frictionally engage a surface of the roll of sheet product, and a spring attached to the arm and configured to bias the arm into engagement with the surface of the roll of sheet product, such that the resistance mechanism provides a pull force resistance opposing a pull force applied to a tail portion of the roll of sheet product.